Dental implant extracting tool

ABSTRACT

A tool for extracting dental implants of the type having a wide blade, a narrow neck and an enlarged head. The tool includes a shank having a lateral extension at one end thereof formed with a slot to receive the neck of an implant. A retainer is adjustably positioned on the shank to prevent disengagement of the implant neck from the slot. The other end of the shank is provided with an elongated handle having a weight slidable thereon against a stop, so that impacts may be delivered through the handle and shank to extract the implant from a patient&#39;&#39;s jaw.

United States Patent [151 3,702,028

Edelman 51 Nov. 7, 1972 [54] DENTAL IMPLANT EXTRACTING FOTLEIGN PATENTSOR APPLICATIONS TOOL llltth llll 1,013,392 8/1957 Germany ..32/6lPrimary Examiner-Robert Peshock Attorney-Munson H. Lane and Munson H.Lane, Jr.

[5 7] ABSTRACT A tool for extracting dental implants of the type havinga wide blade, a narrow neck and an enlarged head. The tool includes ashank having a lateral extension at one end thereof formed with a slotto receive the neck of an implant. A retainer is adjustably positionedon the shank to prevent disengagement of the implant neck from the slot.The other end of the shank is provided with an elongated handle having aweight slidable thereon against a stop, so that impacts may be deliveredthrough the handle and shank to extract the implant from a patients jaw.

P'A'IENTEDuuv 11m I I 3.702.028

I N VEN TOR ALFRED E. EDELMAN ATTORNEY DENTAL IMPLANT EXTRACTING TOOLThis invention relates to new and useful improvements in tools orinstruments for use with dental implants which are placed in the jawbone of a patient to provide anchorage for artificial teeth, bridgework,and the like, such implants being of the type having a wide blade whichis impact-driven into the jaw bone, a narrow neck on the blade, and anenlarged head on the neckto support the dentalwork.

On certain occasions it is desirable to install a tryin implant whichhas to be removed for replacement by another, and on other occasions itis necessary to remove an implant which has already served its purpose.In either event,'the principal object of the invention is to provide aspecial tool or instrument by which an implant may be quickly and easilyextracted from a patients jaw. As such, the special tool of theinvention is simple in construction, efficient in operation, and wellsuited for use with various sizes and designs of implants of theaforementioned type.

With the foregoing more important object and features in view and suchobjects and features which may become apparent as this specificationproceeds, the invention will be understood from the followingdescription taken in conjunction with the accompanying drawings, whereinlike characters of reference designate like parts, and wherein:

FIG. 1 is an elevational view of the extracting tool of the invention,with the handle separated from the shank;

FIG. 2 is a side elevational view, taken from the left side of FIG. 1,showing the tool without the handle;

FIG. 3 is an enlarged plan view, taken from the plane of the line 3-3 inFIG. 1;

FIG. 4 is an enlarged sectional view, taken in the plane of the line 44in FIG. 1;

FIG. 5 is a fragmentary perspective viewshowing the tool in readiness tobe applied to a dental implant;

FIG. 6 is a perspective view showing the tool applied to the implant;

FIG. 7 is a fragmentary elevational view showing, by dotted lines,various possible angulations of the shank extension;

FIG. 8 is a fragmentary perspective view showing the tool in an invertedposition; and

FIG. 9 is a view, similar to that in FIG. 8, but with the tool appliedto an implant.

Referring now to the accompanying drawings in detail, the tool orinstrument of the invention is designated generally by the referencenumeral 10 and is especially adapted for use in extracting a dentalimplant 12 from the jaw bone 13 of a patient, as indicated in FIG. 5.The implant 12 is of the type which includes a wide blade 14 which isimpact-driven into the jaw bone and is provided with a narrow neck 15equipped with an enlarged head 16'.

The implant extracting tool 10 embodies in its construction an elongatedshank 17 which, for most part, may be in the form of a flat strap,having one end portion thereof angulated to provide a lateral extension17a. This extension may be at right angles to the shank, or at an acuteor an obtuse angle thereto, as indicated at 17a and 17a respectively inFIG. 7, as may best be suited for manipulation of the tool in thepatients mouth while affording clearance for protuberances such as lips,chin, nose, et cetera.

In any event, the shank extension 17a is provided with a slot 18 whichis open at one side edge of the extension and extends inwardlytherefrom, the slot 18 being adapted to receive the neck 15 of theimplant 12 when the tool is in use. Preferably, the side edge portionsof the extension 17a adjacent the slot 18 are bevelled as indicated at19, to facilitate application of the tool to the implant.

In order to prevent the tool from becoming displaced from the implantwhile the tool is in use, a retainer 20 is provided on the shank 17adjacent the extension 17a. The retainer 20 includes a channel portion21 which is slidable on the shank 17 toward and away from the extension17a and may be locked in an adjusted position by a locking screw 22. Thelatter extends through an elongated opening or slot 23 formed in thechannel portion 21 and is threaded into the shank 17. The retainer 20also includes a wing portion 24 which extends laterally from the channelportion 21- and is adapted to engage the blade 14 of the implant 12 whenthe retainer 20 is slid toward the shank extension 17a, as shown inFIGS. 6 and 9. In that position the wing portion 24 of the retainer 20closes the open end of the slot 18 in the shank extension 17a and thusprevents the tool from becoming displaced from the neck 15 in the slot18. The wing portion 24 is preferably triangularly shaped to affordclearance and prevent interference with the jaw of the patient.

The other or outer end of the shank l7, remote from the extension 17a,is enlarged to provide a boss 25 equipped with a screw-threaded post 26which is engageable with a threaded bore 27 in one end of a cylindricalhandle 28, whereby the shank 17 may be separably connected to thehandle. The other or outer end of the handle 28 is provided with ascrew-threaded stud 29 having a nut 30 and a washer 31 positionedthereon. A weight or hammer 32 is reciprocable on the handle 28, towardand away from the nut 30, and when the hammer 32 is slid toward the nut30, it produces an impact in the direction of the arrow 32', that is,longitudinally outwardly of the handle 28 and of the shank 17 which isin longitudinal alignment with the handle. The washer 31 is ofelastomeric material and serves as a shock absorber in somewhatcushioning the impact which would otherwise be produced if the hammer 32were permitted to come in direct, positive contact with the nut 30.

When the tool is to be used, the retainer 20 is slid along the shank 17away from the extension 17a so that the slot 18 in the extension is openand the tool may be applied to the dental implant 12 so that the neck 15of the implant is received in the slot 18 of the tool. The retainer 20is then slid toward the extension 17a so that it comes to a positionwhere the wing portion 24 engages the blade 14 of the implant and alsocloses the slot 18 in the extension 17a, as aforesaid, thus in effectlocking the tool to the implant and preventing their relativedisplacement while the tool is in use. The hammer 32 is thenreciprocated along the handle 28 to impact the washer and nut 31, 30 inthe direction of the arrow 32, this impacting force being transmittedthrough the handle 28 and shank 17 to the shank extension 17a and thusto the neck 15 and head 16 of the implant 12, so that the implant isextracted from the patients jaw.

It will be apparent that since the handle 28 is separable from the shank17 at the connection 26, 27, the handle and the manually actuated hammer32 may be substituted by some other suitable impact producing means suchas a pneumatically, hydraulically or electrically powered hammer,attached to the post 26 of the shank l7.

It may be also noted that while in FIG. the tool is shown in readinessfor being applied to the implant 12 in the patients jaw 13 which, inthis instance, is the upper jaw requiring the implant to be extracted inthe downward direction,-the tool is equally applicable for extractingimplants upwardly from the lower jaw, simply by using the tool in aninverted position as for example in FIGS. 8 and 9.

While in the foregoing there has been described an shown the preferredembodiment of the invention, various modifications may be resorted to,falling within the spirit and scope of the appended claims.

What is claimed as new is: I

l. A tool for extracting dental implants of the type having a wideblade, a narrow neck and an enlarged head, said tool comprising anelongated shank provided at one end thereof with a lateral extensionhaving a narrow slot which is open at and extends inwardly from one edgeof said lateral extension for receiving and closely engaging the neck ofan implant, an implant retainer means positioned on said shank adjacentsaid extension and engageable with the blade of an implant at oneside ofthe neck so as to retain the latter in the slot of said extension, andimpact producing means provided at the other end of said elongated shankfor producing, an impact force longitudinally along said shank.

2. The device as defined in claim 1 which is further characterized inthat saidretainer is slidable onsaid shank toward and away from saidextension.

3. The device as defined in claim 2 together with means for locking saidretainer in an adjusted position on said shank.

4. The device as defined in claim 1 wherein said retainer includes achannel portion slidable on said shank toward and away from saidextension, and a wing portion projecting laterally from said channelportion, said wing portion being engageable with the blade of animplant.

5. A tool for extracting dental implants of the type having a wideblade, a narrow neck and an enlarged head, said tool comprising a shankprovided at one end thereof with a lateral extension having a slottherein for receiving the neck of an implant, implant retainer meanspositioned on said shank adjacent said extension andengageable with theblade of an implant at one side of the neck so as to retain the latterin the slot of said shank extension, impact producing means provided atthe other endof said shank, said retainer including a channel portionslidable on said shank toward and I away from said extension, and a wingportion projectretainer. 6. A tool for extracting dental implants of thetype having a wide blade, a narrow neck and an enlarged head, said toolcomprising a shank provided at one end thereof with a lateral extensionhaving a slot therein for receiving the neck of an implant, implantretainer means positioned on said shank adjacent said extension andengageable with the blade of an implant at one side of the neck so as toretain the latter in the slot of said shank extension, and impactproducing means provided at the other end of said shank, said slot beingopen at and extending inwardly from one side'edge of said shankextension, said retainer including a channel portion slidable on saidshank toward and away from said extension, and a wing portion projectinglaterally from said channel portion, said wing portion closing the openend of said slot when the retainer is slid toward said extension toengage the wing portion with the blade of an implant.

7. The device as defined in claim 6 together with means for locking saidretainer in an adjusted position on said shank.

8. The device as defined in claim 1 wherein said impact producing meanscomprise an elongated handle provided at said other end of said shank inlongitudinal alignment therewith, a stop at the outer end of saidhandle, and a weight reciprocable on the handle and impactinglyengageable with said stop.

9. The device as defined in claim 8 together with a shock absorbingelement providedon said handle at said stop for engagement by saidweight.

10. A tool for extracting dental implants of the type having a bodyportion adapted to be embedded in the jaw bone, a head portion and anarrow neck connecting said head with said body portion, said toolcomprising an elongated shank provided at one end thereof with a lateralextension having a slot therein for receiving the neck of an implant,and impact producing means provided at the other end of said elongatedshank for producing an impact force longitudinally along said shank.

11. The tool set forth in claim 10 together with an implant retainermeans positioned on said shank adjacent said extension and engageablewith the blade of an implant at one side of the neck so as to retain thelatter in the slot of said lateral extension.

UNITED STATES PATENT OFFICE CERTIFICATE OF (IQRREQ'HON Patent No. 3 702.028 Dated November 7 1972 lnvent fls) ALFRED E. EDELMAN It is eertifiedthat error appears in the above-identified patent and that said Letters,Patent are hereby corrected as shown below:

On Page 1 (cover page) between the listing of the inventor and theapplication Serial Number 72,606,

the filing date should read as follows:

Filed: September16; 1970 Signed and sealed this 8th day of May 1973.

(SEAL) attest:

EDLRRD i'LFLETCHER fi-L ROBERT GOTTSCHALK.

At'tes'ting Officer Commissioner of Patents FORM PO-105O (10-69)USCOMM-DC 60376-P69 U.S. GOVERNMENT PRINTING OFFICE: 1969 0-366-334,

1. A tool for extracting dental implants of the type having a wideblade, a narrow neck and an enlarged head, said tool comprising anelongated shank provided at one end thereof with a lateral extensionhaving a narrow slot which is open at and extends inwardly from one edgeof said lateral extension for receiving and closely engaging the neck ofan implant, an implant retainer means positioned on said shank adjacentsaid extension and engageable with the blade of an implant at one sideof the neck so as to retain the latter in the slot of said extension,and impact producing means provided at the other end of said elongatedshank for producing an impact force longitudinally along said shank. 2.The device as defined in claim 1 which is further characterized in thatsaid retainer is slidable on said shank toward and away from saidextension.
 3. The device as defined in claim 2 together with means forlocking said retainer in an adjusted position on said shank.
 4. Thedevice as defined in claim 1 wherein said retainer includes a channelportion slidable on said shank toward and away from said extension, anda wing portion projecting laterally from said channel portion, said wingportion being engageable with the blade of an implant.
 5. A tool forextracting dental implants of the type having a wide blade, a narrowneck and an enlarged head, said tool comprising a shank provided at oneend thereof with a lateral extension having a slot therein for receivingthe neck of an implant, implant retainer means positioned on said shankadjacent said extension and engageable with the blade of an implant atone side of the neck so as to retain the latter in the slot of saidshank extension, impact producing means provided at the other end ofsaid shank, said retainer including a channel portion slidable on saidshank toward and away from said extension, and a wing portion projectinglaterally from said channel portion, said wing portion being engageablewith the blade of an implant, and means for locking said retainer in anadjusted position on said shank, said means comprising a locking screwprovided on the shank and extending through an elongated opening formedin the channel portion of the retainer.
 6. A tool for extracting dentalimplants of the type having a wide blade, a narrow neck and an enlargedhead, said tool comprising a shank provided at one end thereof with alateral extension having a slot therein for receiving the neck of animplant, implant retainer means positioned on said shank adjacent saidextension and engageable with the blade of an implant at one side of theneck so as to retain the latter in the slot of said shank extension, andimpact producing means provided at the other end of said shank, saidslot being open at and extending inwardly from one side edge of saidshank extension, said retainer including a channel portion slidable onsaid shank toward and away from said extension, and a wing portionprojecting laterally from said channel portion, said wing portionclosing the open end of said slot when the retainer is slid toward saidextension to engage the wing portion with the blade of an implant. 7.The device as defined in claim 6 together with means for locking saidretainer in an adjusted position on said shank.
 8. The device as definedin claim 1 wherein said impact producing means cOmprise an elongatedhandle provided at said other end of said shank in longitudinalalignment therewith, a stop at the outer end of said handle, and aweight reciprocable on the handle and impactingly engageable with saidstop.
 9. The device as defined in claim 8 together with a shockabsorbing element provided on said handle at said stop for engagement bysaid weight.
 10. A tool for extracting dental implants of the typehaving a body portion adapted to be embedded in the jaw bone, a headportion and a narrow neck connecting said head with said body portion,said tool comprising an elongated shank provided at one end thereof witha lateral extension having a slot therein for receiving the neck of animplant, and impact producing means provided at the other end of saidelongated shank for producing an impact force longitudinally along saidshank.
 11. The tool set forth in claim 10 together with an implantretainer means positioned on said shank adjacent said extension andengageable with the blade of an implant at one side of the neck so as toretain the latter in the slot of said lateral extension.